1 thing that I now do for electrical lighting, I went to the hardware store and got "pigtails", it's 2 wires, screw type bulb socket that hooks onto a 6 volt battery. it uses 6 volt screw single post light bulbs. The battery will support 1 pigtail for 24 hours. It provides enough light to play cards or a board game. It's a safe "night light" for nervous children to go to sleep by.
This pigtail is one of a few backup lighting systems that I use for emergencies. My all time favorite still remains: the Hurricane Lamp, it offers light and heat. heat for the room and/or heat to cook over, & lamp oil is dirt cheap!